3ZM-GRIMEX - Ground water simulation

The flood 2002 at the Elbe River showed that besides the apparent damages by surface waters, considerable damage was caused by groundwater and waters from the sewer system. Fast rising groundwater levels due to infiltration of overland flow or water from the sewer system can damage basements and can be a serious thread to the static of houses. The objective of the project 3ZM-GRIMEX is the development of a software system for the coupled simulation of three components: surface water, groundwater, and sewer water. The coupled system will be used in flood risk management.

Used Approach

The implementation of the software system is based on MpCCI. Exchanged quantities are water heights and water fluxes between the components.

The strategy of this project is to use established simulation programs for each of the three domains. These programs have been approved for their particular area of application. They will be coupled with each other with the MpCCI software. MpCCI manages the communication between the individual programs, i.e., the mapping between the different model geometries, the time synchronization, and the data exchange.

Depending on the task, two different codes will be used for each, the overland flow (RisoSurf, TrimR2D) and the sewerage system (Hamoka, Hystem-Extran). Because the groundwater code (PCGEOFIM) can calculate selected regions with finer spatial resolution, it can be used for large scale simulations, coupling with TrimR2D and Hystem-Extran, as well as for small scale simulations, coupling with Risosurf and Hamoka.

Model of Dresden

For the urban region of Dresden the simulated area is divided into a global model and a few local models. The global model extends parallel to the river Elbe on each side of it where buildings and streets are only roughly taken into account and the sewer system is modeled without details. Here the combination of the programs TrimR2D, Hystem-Extran, and PCGEOFIM is applied. The local models are computed with details on the surface, such as buildings and curbs, and with more manholes in the sewerage system. In this case the combination of the programs RisoSurf, Hamoka, and PCGEOFIM is used.

The identification and definition of the relevant water flows between

the individual components of the flow system was an important step of

the project.

Project Patners

Project Weblink:

www.dgfz.de/hochwasser/3ZMGRIMEX/

Dresdner Grundwasserforschungszentrum e.V (DGFZ)

Projektleitung/-koordination

Grundwassermodellierung

Fraunhofer Institut für Techno- und Wirtschaftsmathematik (ITWM)

Detailmodellierungen

Fraunhofer Institut für Algorithmen und Wissenschaftliches Rechnen (SCAI)

Modellkopplung

Technische Universität Dresden

Institut für Siedlungs- und Industriewasserwirtschaft (TUD)

Kanaluntersuchung/-modellierung

Umweltforschungszentrum Leipzig-Halle

Dpt. f. Angewandte Landschaftsökologie

Oberflächenwassermodellierung

Landeshauptstadt Dresden - Umweltamt (LHDD)

Daten Pilotgebiet

Funded by

Bundesministeriums für Bildung und Forschung (BMBF)

Förderschwerpunkt "Risikomanagement extremer Hochwasserereignisse

Förderkennzeichen 02WH0557